| 72 PIN SIMM | ||||||||
| COMMODORE 64 | ||||||||
| Pin | Label | Description | IC-1 | IC-2 | ||||
| 1 | VSS | Ground | 18 | PD2 | PD1 | Size | ||
| 2 | DQ0 | Data 0 | 2 | GND | GND | 4 or 64 MB | ||
| 3 | DQ16 | Data 16 | GND | NC | 2 or 32 MB | |||
| 4 | DQ1 | Data 1 | NC | GND | 1 or 16 MB | |||
| 5 | DQ17 | Data 17 | NC | NC | 8 MB | |||
| 6 | DQ2 | Data 2 | 15 | |||||
| 7 | DQ18 | Data 18 | PD4 | PD3 | Access | |||
| 8 | DQ3 | Data 3 | 17 | GND | GND | 50, 100 ns | ||
| 9 | DQ19 | Data 19 | GND | NC | 80 ns | |||
| 10 | VCC | +5 VDC | 9 | NC | GND | 70 ns | ||
| 11 | n/c | Not connected | NC | NC | 60 ns | |||
| 12 | A0 | Address 0 | 14 | |||||
| 13 | A1 | Address 1 | 13 | |||||
| 14 | A2 | Address 2 | 12 | |||||
| 15 | A3 | Address 3 | 11 | |||||
| 16 | A4 | Address 4 | 8 | |||||
| 17 | A5 | Address 5 | 7 | |||||
| 18 | A6 | Address 6 | 6 | |||||
| 19 | A10 | Address 10 | ||||||
| 20 | DQ4 | Data 4 | 2 | |||||
| 21 | DQ20 | Data 20 | ||||||
| 22 | DQ5 | Data 5 | 3 | |||||
| 23 | DQ21 | Data 21 | ||||||
| 24 | DQ6 | Data 6 | 15 | |||||
| 25 | DQ22 | Data 22 | ||||||
| 26 | DQ7 | Data 7 | 17 | |||||
| 27 | DQ23 | Data 23 | ||||||
| 28 | A7 | Address 7 | 10 | |||||
| 29 | A11 | Address 11 | ||||||
| 30 | VCC | +5 VDC | ||||||
| 31 | A8 | Address 8 | ||||||
| 32 | A9 | Address 9 | ||||||
| 33 | /RAS3 | Row Address Strobe 3 | ||||||
| 34 | /RAS2 | Row Address Strobe 2 | ||||||
| 35 | PQ3 | Parity bit 3 (for the 3rd byte, bits 16-23) | ||||||
| 36 | PQ1 | Parity bit 1 (for the 1st byte, bits 0-7) | ||||||
| 37 | PQ2 | Parity bit 2 (for the 2nd byte, bits 8-15) | ||||||
| 38 | PQ4 | Parity bit 4 (for the 4th byte, bits 24-31) | ||||||
| 39 | VSS | Ground | ||||||
| 40 | /CAS0 | Column Address Strobe 0 | 16 | |||||
| 41 | /CAS2 | Column Address Strobe 2 | ||||||
| 42 | /CAS3 | Column Address Strobe 3 | ||||||
| 43 | /CAS1 | Column Address Strobe 1 | ||||||
| 44 | /RAS0 | Row Address Strobe 0 | 5 | |||||
| 45 | /RAS1 | Row Address Strobe 1 | ||||||
| 46 | n/c | Not connected | ||||||
| 47 | /WE | Read/Write | 4 | |||||
| 48 | n/c | Not connected | ||||||
| 49 | DQ8 | Data 8 | ||||||
| 50 | DQ24 | Data 24 | ||||||
| 51 | DQ9 | Data 9 | ||||||
| 52 | DQ25 | Data 25 | ||||||
| 53 | DQ10 | Data 10 | ||||||
| 54 | DQ26 | Data 26 | ||||||
| 55 | DQ11 | Data 11 | ||||||
| 56 | DQ27 | Data 27 | ||||||
| 57 | DQ12 | Data 12 | ||||||
| 58 | DQ28 | Data 28 | ||||||
| 59 | VCC | +5 VDC | ||||||
| 60 | DQ29 | Data 29 | ||||||
| 61 | DQ13 | Data 13 | ||||||
| 62 | DQ30 | Data 30 | ||||||
| 63 | DQ14 | Data 14 | ||||||
| 64 | DQ31 | Data 31 | ||||||
| 65 | DQ16 | Data 16 | ||||||
| 66 | n/c | Not connected | ||||||
| 67 | PD1 | Presence Detect 1 | ||||||
| 68 | PD2 | Presence Detect 2 | ||||||
| 69 | PD3 | Presence Detect 3 | ||||||
| 70 | PD4 | Presence Detect 4 | ||||||
| 71 | n/c | Not connected | ||||||
| 72 | VSS | Ground | ||||||
| Notes: A9 is a N/C on 256k and 512k modules. | ||||||||
| A10 is a N/C on 256k, 512k, 1M and 4M modules. | ||||||||
| RAS1/RAS3 are N/C on 256k, 1M and 4M modules. | ||||||||
| SIZES AVAILABLE, 72-pin SIMM: | ||||||||
| 1MB, 2MB, 4MB, 8MB, 16MB, 32MB, 64MB, 128MB | ||||||||
| TESTED & WORKING RAM TYPES/MODELS:- | ||||||||
| "V" 8MB - VG264400BJ -7 (Double sided 16 x RAM CHIPS per SIMM) | ||||||||
| "IBM" 4MB - K20008 PQ (Single sided 9 X RAM CHIPS) | ||||||||
| © THE VORTEX 2007 | ||||||||